DISC Alto Truesonic Sub 15" Active PA Subwoofer | Gear4music
Alto Truesonic TS Sub 12 Active Subwoofer with DJ Tutor @ www.getinthemix.co.uk - YouTube
Amazon.com: Alto Professional TS315S | 2000 Watt 15 Inch Powered Portable PA Subwoofer With Selectable DSP Output Modes For Matching With Companion PA Speakers : Musical Instruments
Alto Professional - LEGACY SPEAKERS Series > TSSUB12